Under the authority of the counts of Provence, a castrum (fortified site) was built in the 13th century to defend Tarascon and the traffic routes. The number of soldiers present varies depending on the events until the end of the 16th century. Today, only the main tower and vestiges remain. The facing of the tower is adorned with a remarkable boss. On the blocks of stones, the different signs makes it possible to identify the stone carver and to pay him accordingly.